Thermostat.



Patented llar. l8, I902.

' a. a. SHERMAN.

TH ERHOSTAT.

(Applicatiolijled June 27. 1901.)

(No Model.)

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ATTORNEY-E.

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UNITED STATES PATENT OFFICE.

GEORGE It. SHERMAN, OF PROVIDENCE, RHODE ISLAND.

TH ERMOSTAT.

SPECIFICATION forming part of Letters Patent No. 695,655, dated March 18, 1902. Application filed June 27, 1901. Serial No. 66,216. (No model.)

To (tZZ whom it may concern:

Be it known that I, GEORGE R. SHERMAN, a citizen of the United States, residing at Providence, in the county of Providence and State of Rhode Island, have invented a new and useful Improvement in Thermostats, of which the following is a specification.

This invention has reference to an improvement in the class of thermostats by which on the rise of the temperature an electric circuit may be closed or opened, and thereby notice of such rise of temperature may be transmitted by suitable electromagnetic and possibly other devices.

The object of this invention is to produce a simple device that can be cheaply made and conveniently tested as to its efficiency.

The invention consists in the peculiar and novel construction and combination of the parts, as will be more fullyset forth hereinafter.

Figure l is a top view showing the operative parts of my improved thermostat with the cap in section. Fig. 2 is a sectional view of the thermostat. Fig. 3 is a top view of the cap, showing the detent secured by a fusible solder. Fig. 4 is a side view of the cap, partly in section, showing the detent. Fig. 5 is a top view, like Fig. 1, showing the operative parts in the positions occupied by them in a closed circuit. This position may be the normal position or the position after the detent has been released.

Similar marks of reference indicate corre sponding parts in all the figures.

In the drawings, a indicates a block of insulating material, preferably provided with the arms a a for securing the thermostat and the arms a a on which the binding-posts of any suitable form are placed, to connect the line-wires. The post a forms, preferably, part of the block a. The terminal wire, Z) connects with the binding-post 0, extends through the block a, and forms the loop Z), projecting above the face of the block a. The terminal wire d connects with the bindingpost 0, extends through the block a, is coiled around the post (4 extends across the face of the block a, and is bent into the loop d, one

arm of which is in line with the loop Z2 and the other arm with the detent e, which extends through the slot 6 in the cap 6.

The cap 6, preferably formed of thin sheet metal, is placed over the operative parts and fits the peripheral shoulder a of the block ct and may be rotated on the same. The pins 6 e serve to secure the cap 6 in the desired position. Screws or othersuitable fastening devices may be used to secure the cap c.

When the detent e is inserted in the slot 6 and the plate a forming part of the detent, is secured to the cap 0 by a solder fusible at the desired temperature, the cap is placed on the peripheral shoulder a of the block ct and is rotated until the detent encounters the loop d and moves the same against the ten sion of the coiled portion on the post a until the loop d is in the desired normal position. The cap is now secured in this normal posi-- tion to the block a by the pins c or other de vices. IVhen the temperature rises to the fusing-point of the solder by which the detent is held, the detent is released and may rock or slide in the slot 6 releasing the springarm of the wire 61, which forms the loop 61, which quickly moves into the operative position either against the loop b to close the circuit or away from the loop h to break the circuit.

In Fig. 1 the loop (Z is shown in solid lines held by the detent c away from the loop I) and is shown in broken lines as released and in contact with the loop I), acting to close the circuit.

In Fig. 5 the reverse operation is illustrated. The circuit is closed by the loop (Z, being shown in solid lines in contact with the loop 1), held by the detent e, and in broken lines away from the loop I) when the detent is released to break the circuit.

Having thus described my invention, I claim as new and desire to secure byLetters Patent 1. A thermostat having one terminal Wire connected with a contact secured in a block of insulating material, a cap rotatably mounted on the block, a detent projecting beyond the inner surface of the cap and secured to the outer surface of the cap by fusible solder, means for securing the cap to the block, in combination with a terminal connected with a spirally-wound wire, having a contact-arm swinging when released horizontally to make or break the circuit, as described.

2. In a thermostat, the combination with In testimony whereof I have signed my the post 0, the wire I), the loop I), the post 0', name to this specification in the presence of 10 the wire dcoiled around the post a the looped two subscribing witnesses.

arm d, and the block a, of the cap rotatably 1 5 supported on the block, the slot 6 in the cap, SHERMAN the detent e extendingthrough the slot and Witnesses: secured to the cap by fusible solder and the pins 6 6 as described.

ADA E. HAGERTY, JOSEPH A. MILLER. 

